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This morning it was fine and I got the error while running a scan. I then restarted the scan and it went fine. I don't know what to think.

I read the other post that all pointed to the same solution to uninstall and install the latest release. But I can't because it is a part of the OS. Also I read an article that said the same thing but it was from the end of 2007 I think.

I use XP, but look under Services & see if the Windows Defender Service Startup is set to Automatic & that Log -On is set to Enabled. If no luck, or if the problem keeps occurring, you may have to disable it & keep it from running at start-up.